package com.guet.careapp.controller.spring;

import com.google.gson.Gson;
import com.guet.careapp.common.Constants;
import com.guet.careapp.controller.rest.common.errorCode.Error;
import com.guet.careapp.controller.rest.common.errorCode.ErrorCodeFactory;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

/**
 * Created by LXM on 2017/10/30.
 *
 * @author LXM
 * @version 1.0
 * @description
 * @datetime 15:52
 */

@Controller
public class FileController extends javax.servlet.http.HttpServlet {

  Logger logger = LoggerFactory.getLogger(FileController.class);
  private static final long serialVersionUID = 1L;

  // 上传文件存储目录
  private static final String UPLOAD_DIRECTORY = Constants.UPLOAD_PATH;

  // 上传配置
  private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3;  // 3MB
  private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
  private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB

  /**
   * 上传
   */
  @RequestMapping(value = "/emergency", method = RequestMethod.POST)
  public void upload(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // 检测是否为多媒体上传
    if (!ServletFileUpload.isMultipartContent(request)) {
      // 如果不是则停止
      PrintWriter writer = response.getWriter();
      writer.println("Error: 表单必须包含 enctype=multipart/form-data");
      writer.flush();
      renderData(response, new Gson().toJson(ErrorCodeFactory.get(Error.Unkonwn)));
      return;
    }

    // 配置上传参数
    DiskFileItemFactory factory = new DiskFileItemFactory();
    // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
    factory.setSizeThreshold(MEMORY_THRESHOLD);
    // 设置临时存储目录
    factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

    ServletFileUpload upload = new ServletFileUpload(factory);

    // 设置最大文件上传值
    upload.setFileSizeMax(MAX_FILE_SIZE);

    // 设置最大请求值 (包含文件和表单数据)
    upload.setSizeMax(MAX_REQUEST_SIZE);

    // 中文处理
    upload.setHeaderEncoding("UTF-8");

    // 构造临时路径来存储上传的文件
    // 这个路径相对当前应用的目录
    String uploadPath =
        request.getServletContext().getRealPath("./") + File.separator + UPLOAD_DIRECTORY;

    // 如果目录不存在则创建
    File uploadDir = new File(uploadPath);
    if (!uploadDir.exists()) {
      uploadDir.mkdirs();
    }

    try {
      // 解析请求的内容提取文件数据
      @SuppressWarnings("unchecked")
      List<FileItem> formItems = upload.parseRequest(request);

      if (formItems != null && formItems.size() > 0) {
        // 迭代表单数据
        for (FileItem item : formItems) {
          // 处理不在表单中的字段
          if (!item.isFormField()) {
            String fileName = new File(item.getName()).getName();
            String filePath = uploadPath + File.separator + fileName;
            File storeFile = new File(filePath);
            // 在控制台输出文件的上传路径
            System.out.println(filePath);
            // 保存文件到硬盘
            item.write(storeFile);
            logger.info("文件上传成功");

          } else {
            String name = item.getFieldName();
            String value = item.getString("utf-8");
            //这里开始解析字符串,发送JPush请求

          }
        }
      }
    } catch (Exception ex) {
      request.setAttribute("message",
          "错误信息: " + ex.getMessage());
    }

    renderData(response, new Gson().toJson(ErrorCodeFactory.get(Error.Success)));

  }


  /**
   * 返回结果
   */
  private void renderData(HttpServletResponse response, String path) {
    PrintWriter printWriter = null;
    try {
      response.setHeader("Content-type", "text/html;charset=UTF-8");
      printWriter = response.getWriter();
      printWriter.print(path);
    } catch (IOException ex) {
      ex.printStackTrace();
    } finally {
      if (null != printWriter) {
        printWriter.flush();
        printWriter.close();
      }
    }
  }
}
